کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6399007 1330689 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of isolation, enzymatic hydrolysis, heating, hydratation and Maillard reaction on the antioxidant capacity of cereal and legume proteins
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
پیش نمایش صفحه اول مقاله
Effects of isolation, enzymatic hydrolysis, heating, hydratation and Maillard reaction on the antioxidant capacity of cereal and legume proteins
چکیده انگلیسی

The antioxidant capacity of maize proteins, wheat gluten, pea protein isolates and hydrolysates and melanoproteins (MRPs) was evaluated as a radical scavenging activity against ABTS (2,2-azino-bis/3-ethil-benothiazoline-6-sulfonic acid) reagent by the direct procedure. In addition, the effect of high temperature and water during thermal treatments on changes of the antioxidant capacity of proteins was investigated. The concentration of total cysteine, free sulfhydryl groups (− SH) and disulfide bonds (− S-S) were determined using Ellman's reagent, 5,5′-dithiobis (2-nitrobenzoic acid) (DTNB) and disodium 2-nitro-5-thiosulfobenzoate (NTSB2 −). Wheat gluten, as the most complex protein, had higher concentration of disulfide bonds (45.37 nmol/mg) and total cysteine (93.88 nmol/mg) compared to other tested proteins and showed the highest ABTS radical scavenging activity (74.39 mmol Trolox/kg). The antioxidative capacity of tested proteins was correlated negatively with free -SH group concentration and positively with total cysteine and -S-S bond concentration indicating a high effect of physical structure of a protein on its antioxidative properties. The antioxidant activity of melanoproteins formed in pea protein isolate/glucose model system during heating was threefold higher than that of initial pea protein. However, the highest amount of furosine was also formed in this model system under the same heating conditions.

► The antioxidant capacity of different proteins and melanoproteins was evaluated ► Wheat gluten showed the highest ABTS radical scavenging activity ► The natural antioxidants in processed food could be balanced by melanoproteins ► High correlation was found between S-S bonds concentration and antioxidant capacity ► Enzymatic hydrolysis and thermal processes affect the protein antioxidant capacity

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Research International - Volume 49, Issue 1, November 2012, Pages 1-6
نویسندگان
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